main task: #19857
subtask: #21392
- For GET /api/v1/fleet/vulnerabilities/{cve} endpoint, added validation
of CVE format, and added a 204 response. The 204 response indicates that
the vulnerability is known to Fleet but not present on any hosts.
- Removed the previous known_vulnerability field implementation
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/Committing-Changes.md#changes-files)
for more information.
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality
Victor Lyuboslavsky
cd14831e44